Palaeopagurus is an extinct genus of hermit crab from the Lower Cretaceous.

A fossil of the species P. vandenengeli is notable for having been preserved in situ in the shell of an ammonite. Along with a lack of fossils of hermit crabs in gastropod shells from before the Late Cretaceous, this suggests that ammonite shells may have played a more important role in the early evolution of hermit crabs' characteristic shell-dwelling habits. It contains the following species:

  • †Palaeopagurus acutus Crônier & Courville, 2004
  • †Palaeopagurus couloni (de Tribolet, 1874)
  • †Palaeopagurus cretaceous Mertin, 1941
  • †Palaeopagurus deslongchampsi Van Straelen, 1924 (type species)
  • †Palaeopagurus guilleaumei Van Straelen, 1924
  • †Palaeopagurus jurensis (Étallon, 1861)
  • †Palaeopagurus kellowiensis (Étallon, 1861)
  • †Palaeopagurus laevis Van Straelen, 1924
  • †Palaeopagurus morinicus (Sauvage, 1891)
  • †Palaeopagurus neraudeaui Crônier & Courville, 2004
  • †Palaeopagurus pilsbryi Roberts, 1962
  • †Palaeopagurus quadratus Van Straelen, 1924
  • †Palaeopagurus rumignyensis Fischer, 1969
  • †Palaeopagurus schneidi Kuhn, 1936
  • †Palaeopagurus serialis (Carter, 1886)
  • †Palaeopagurus spinosus Van Straelen, 1924
  • †Palaeopagurus tuberculatus Van Straelen, 1924
  • †Palaeopagurus vandenengeli Fraaije, 2003
  • †Palaeopagurus würgauensis Kuhn, 1936